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  • Cell Tower Interference SDR Trunk - RadioReference. com Forums
    I have been monitoring a P25 Phase II LSM 700MHZ system for a few years now with a Airspy R2 with no issues The system is in the range of 769-774 MHZ Recently a new cell tower was installed very close to my house (1000 feet) I’m now having problems with audio distortion ever since the new
  • P25 C4FM vs CQPSK LSM - Listening to tell the difference
    If you're looking at getting a digital scanner, it can be difficult to tell what system support you need, especially making the decision between an SDS with its simulcast support or an older model without it The RRDB is a great tool, but sometimes simulcast vs standalone is difficult to
  • Exploring Continuous Four Frequency Modulation (C4FM) and Linear . . .
    Currently, we are in the process of transitioning to the P25 standard Our focus has turned toward understanding the implications of Continuous Four Frequency Modulation (C4FM) and Linear Simulcast Modulation (LSM) within VHF conventional simulcast systems
  • C4FM vs CQPSK - Scan Behavior - RadioReference. com Forums
    The trace on the right is definitely CQPSK (or LSM) and that trace is similar to what I would be looking for on the Anritsu The main difference being that my displayed trace (s) would have two "center" open "windows"
  • SDRTrunk using RadioReference P25 Channel lists noob question
    Use the P25 Phase 1 decoder Since this is a simulcast site, use the 'LSM' (vs 'C4FM') option 2 Use only 1 channel configuration You can probably use just the single frequency input to start If the primary control frequency repeater goes down for some reason, the site will automatically start using one of the 'a = alternate' control
  • LSM CQPSK Simulcast vs. Other Types - RadioReference. com Forums
    Does anyone know how to determine if a simulcast P25 system is LSM CQPSK or another type? There is a video showing the new BCD436HP scanner performing pretty well receiving the Ft Worth simulcast system, but it was pointed out that the Ft Worth system isn't the most difficult type of
  • P25 LSM (Linear Simulcast Modulation) Difficulties
    [cross-posted from op25-dev] Locally we have a Motorola system that runs in the 800 MHz band and is believed to be running with LSM I have been having extreme difficulty in achieving correct symbol recovery from any of the channels in this system, even though the signal strength is very strong
  • 2024 FIRESCOPE Radio Communications Guide - RadioReference. com Forums
    I don't think I've seen it posted this year, but here's the 2024 FIRESCOPE Radio Communications Guide Some changes include OES 1A, 1B, 2A, 2B being renamed to OES V1-V4, and the individual USFS service nets appear to be consolidated shared between different forests Some local channels added
  • Simulcast issues with Uniden BCD996P2 radio - RadioReference. com Forums
    Everyone's results are going to be different based upon location, location, location scanmanmi: The only way to know if you will experience LSM Distortion in to try it out precisely where you intend to monitor
  • Control Channel Modulation - RadioReference. com Forums
    After reading the postings in a state forum on control channel modulation regarding trunking sites astro25 9600 control channel modulation C4FM vs CQPSK I understand that simulcast sites are CQPSK(LSM) and ASR Astro Standalone Repeater fill in sites typically do not use simulcast? and are





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